Chain scraping on rear sprockets

elyob said:

The problem is on the higher gears, and when I 'give it a bit' it makes a scraping noise under
pressure.

On the big ring only? If so, and the noise sounds like the chain scraping the front derailleur, then
you probably need to twiddle the H screw (and possibly cable) more to allow room for crankset and
frame flex when you apply the welly. Altering the angle of the front derailleur may also help.

Quoted message said:

Middle ring to biggest ring is all fine.

Sorry, I'm not clear what you mean. No problems at all when using middle and outer chainrings?

If problem is only occurring on the little ring - you shouldn't be using the small ring-small rear
sprockets combinations at all (chain will be too crossed over).

~PB

"Pete Biggs" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

elyob said:

The problem is on the higher gears, and when I 'give it a bit' it makes a scraping noise under
pressure.

On the big ring only? If so, and the noise sounds like the chain scraping the front derailleur,
then you probably need to twiddle the H screw (and possibly cable) more to allow room for crankset
and frame flex when you apply the welly. Altering the angle of the front derailleur may also help.

Quoted message said:

Middle ring to biggest ring is all fine.

Sorry, I'm not clear what you mean. No problems at all when using middle and outer chainrings?

If problem is only occurring on the little ring - you shouldn't be using the small ring-small rear
sprockets combinations at all (chain will be too crossed over).

~PB

Sorry, I'm always a bit vauge ... I really felt like saying 'the thingie on the whodjamiflip'

It's on the small rings (outer chainring?) that the noise happens ... It happens on the bottom
three, though I don't use the smallest one or two due to crossing the chain as you mentioned. That
was a good point r.e. flex .. i'm a big lad ... I'll have a play with it tonight and see what
happens. The H is for the small rings, right?

Thanks

Nick

elyob <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

"Pete Biggs" <[email hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

elyob said:

The problem is on the higher gears, and when I 'give it a bit' it makes a scraping noise under
pressure.

On the big ring only? If so, and the noise sounds like the chain scraping the front derailleur,
then you probably need to twiddle the H screw (and possibly cable) more to allow room for
crankset and frame

flex

Quoted message said:

Quoted message said:

when you apply the welly. Altering the angle of the front derailleur

may

Quoted message said:

Quoted message said:

also help.

Quoted message said:

Middle ring to biggest ring is all fine.

Sorry, I'm not clear what you mean. No problems at all when using

middle

Quoted message said:

Quoted message said:

and outer chainrings?

If problem is only occurring on the little ring - you shouldn't be using the small ring-small
rear sprockets combinations at all (chain will be

too

Quoted message said:

Quoted message said:

crossed over).

~PB

Sorry, I'm always a bit vauge ... I really felt like saying 'the thingie

on

Quoted message said:

the whodjamiflip'

It's on the small rings (outer chainring?) that the noise happens ... It happens on the bottom
three, though I don't use the smallest one or two

due

Quoted message said:

to crossing the chain as you mentioned. That was a good point r.e. flex .. i'm a big lad ... I'll
have a play with it tonight and see what happens. The H is for the small rings, right?

Thanks

Nick

Check the angle of dangle screw. The chain may be touching on the underneath of the derailleur. I
put up with a noise for weeks before I realised what it was!

--
Mark
____________________________
Practice does not make perfect... Perfect practice makes perfect

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elyob said:

It's on the small rings (outer chainring?) that the noise happens ... It happens on the bottom
three, though I don't use the smallest one or two due to crossing the chain as you mentioned. That
was a good point r.e. flex .. i'm a big lad ... I'll have a play with it tonight and see what
happens.

I'm sorry mate, I can't figure out what's going on there. It's one of those situations where I would
need to get my eyeballs, lug holes, mitts and backside on the bike.

Quoted message said:

The H is for the small rings, right?

It stops the derailleur shifting the chain off the outside of the largest chainring.

"Chainrings" or "rings" = front sprockets on the cranks

As an alternative to SB's instructions, try:
parktool.comFAQindex.shtmlOpen ↗

~PB